The author establishes that the "teared up" (a neologism) occurred prior to the previous actions/events in the Past Tense. Once you establish the new time frame with Past Perfect, and the sequence of subsequent events is in the correct order with regard to time, the Past Tense is used. " where we have a Past Tense verb followed by a Present Tense verb.
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There is an unexpected use of the Past Perfect. The implication is, whew, I’ve made it – I’ve caught the train on time…..now, NOW.. I can concentrate on preparing my report. All that went before is now separated off from the events that are now going to unfold. The 'abrupt' use of the Past Perfect signals some kind of c